System of signaling.



PATENTED JULY 17, 1906. P. WINSOR.

SYSTEM OF SIGNALING. APPLICATION TILED JAN. 27. 1902.

963 (MW/W J 2 n4; NuRkls PETERS ca vnsm wwm av safeguard the'said relayor magnet from ex- UNITED STATES PATENT OFFICE.

MASSACHUSETTS, ASSIGNOR TO THE UNION OF SWISSVALE, PENNSYLVANIA, A

CORPORATION OF PENNSYLVANIA.

SYSTEM OF Specification of Letters Patent.

SIGNALING.

Patented July 17, 1906.

Application filed January 27, 1902. Serial No- 91,332.

To all whom it may concern:

Be it known that I, PAUL WINSOR, a citizen of the United States, residing in Weston,- in the county of Middlesex and State of Massachusetts, have invented an Improvement in Systems of Signaling, of which the following description, in connection with the accompanying drawings, is a specification, like letters and numerals on the drawings representing like parts.

This invention relates to a system of signaling especially designed and adapted for railways, and is an improvement upon the block system of signals as now commonly used.

In the block-signaling system as now commonly employed and known to me the dangar-signal for each block or section of the track is operated or controlled in its operation by an electromagnet or relay in circuit with the rails of the track comprising the section, which relay or magnet is normally energized by the si nalcurrent when the track-section or bloc is clear, but which is shortcircuited and designed to be denergized when a locomotive or car is upon the track-section or block, which short circuit is designed to operate the signal and cause it to assume a position at danger.

This invention has for its object to render the block system .safeagainstfalsesignals due to currents other thanthe si nal-currents, and for this purpose the signal relay or magnet in accordance with this invention is ma e responsive to thesignal-currents flowing' through the track-circuit, but isprotected against and is irresponsive to extraneous currents'which may pass through the trackcircuit-such, for instance, as a trolley-current which may leak to the rails of a steamrailroad located in substantially close proximity thereto.

In the present embodiment of this invention the signal relay or magnet isresponsive to a current rapidly varyin in strepgthand of such"'a"character as" wil "affect .the said magnet'Jor're'lay through a transformer or a condenser," whicli latter instru'r'riexit'alities traneous direct currents on the track'circuit. These and other features of this invention will be pointed out in the claims at the end of the specification.

Figure 1 is a diagrammatic view of a suflicient portionof a signalin system embodying this invention to enabIe it to be understood, and Fig. 2 a like view of a modification to be referred to.

Referring to Fig. 1, a I) represent the rails of a track which is separated into blocks or sections by suitable insulation 0 in one of the rails, herein shown as the rail 1). In the present instance the rail 1; is shown as se arated into four sections 1 2 3 4, each of which may be of any desired length, and it will be understood that the rail 1; may be separated into any desired number of sections or blocks. QQLbIOQk.Q1I.tm k':QQ Z Q s hera as is supplied witha normaIsignal-current from a' transformer d, the primary ooiLaof which isfcoi'i fiected by wires with a main-line 2211; an"alternating"'current from an alternatingcurrent generator 6, connected by wires 7' k with the conductor h and with the rail a. The secondary coil m of the transformer is connected to the rail (1 by wire n and to the section 2 of the rail b, near one end of said section, by wire 0. The section 2 has connected to it near its other end by wire 1) one end of the primary coil of a transformer r, the other end of which is connected by the wire 8 with therail a. The secondary coil 6 of the transformer r is connected by wires 7 8 in circuit withjhgsi nal magnet or relay 9, whioh'm'afliof an 'suitatletanstruaion and-in the present instance is represented as provided with the armature 10, pivoted at 12 and cooperating with a front stop 13, the armature 10 being represented as acted u on by a retracting-spring 14. As representeg in Fig. 1, the track-section 2 is s ort-circuited w mwhmticonventiorially represent a locomoti'fi'or'a car, and when the said section is thus short-circuited the current flows through the said wheels and axle and no longer flows through the primary coil q of the transformer 1'. Consequently the signal relay or magnet 9 is deenergized or weakened to such extent as to permit the armature 10 to be withdrawn by its sprin 14, thus placing the signal at danger, w 'ch signal may be the armature itself, or, as is preferred, the armature opens a local circuit including the armature 10 and i9. .Wi hfih m l and uctor h supplied with front sto 13 and a separate magnet, (not 105 shown,) ut which directly operates the signal, which may be of any usual construct ion .such as a semaphore. As represented n Fig. 1,-the track-section-3 is clear,and 1n this case the relay or magnet '9 is energized and its :ar'

mature is attracted, thus setting the signal at safety. By reference to section f the track it will be observed that when the said track-circuit comprising a relay, signal controlled in its operations 4 '1 :and means which section is short-circuited as described any direct current which light flow through the track-circuit would not energize the signal magnet or relay 9, and consequently would not affect the signal or change its os1t1on 'from' danger to safety,*as woul be'the case if the'relay were energized byan extra- .neous direct current.

' ilisathes gnakcurrentisp a feriificharacter froma cgntmgous or dlrect current a s ishqw commonlyhrriployed as the p owr cili'rent ogflgch iihrailways, and

by theterni 'chaia cter employed in the claims I desire to be understood as meaning some such 'diflerence' as above'pointed out and not amere difference in the strength or in the direction of flow of a current of one kind .or character.

I claim- '1. In a signaling system for railways, a

by said reay, a source of current-supply for said relay,

permit said relay responding'to the current intended for it and which prevents said relay being affected to control the operations of .rentstraversing said track-circuit of a difsaid railway-signal by cur- "ferent character.

a railway-' 2. In a signaling system" for "railways, a track-circuit comprising a source of current therefor which rapidly varies in strength, a relay responsive thereto,-and means which permits said current to affect the relay and prevents any other currents traversing said track-circuit affecting the relay.

3. In a signaling system for railways, a track-circuit, comprising an alternating-current supplyv for said track-circuit, a relay in said track-circuit, and means which permits said alternating current to affect the relay and prevents direct currents traversing the track-circuit affecting said relay.

4. In 'a signaling system for 'railways a track-circuit comprising a relay,-a source of current-supply 'for "affecting --"said "relay to have'it control one operation of -a*ra-"ilwaysignal, and means for preventing-a difierent current traversing the track-circuit from-affectin the relay.

5. n a signaling system'of-the"class"described, the combmation'with "a track-circuit, of an alternating-currentgenerator,-a transformer having its primary coil in circuit with said generator'and its secondary coil in said track-circuit, asecond transformer having its primary coil in said track-c-ircuit,- and a signal'magnet or'relayin circuit witht'he secondary coil of said second transformer, substantially as described.

'6. In asignali-ng system,- the combination of a series of track signal ing-circuits, asource of current from which each of said track-signaling-circuits-are supplied, a rel aydevice'for each track signaling-circuit, arid-meansin each track signaling-circuit for preventinga different current traversing the track circuit from operating the translating device.

In testimony whereof I 1 have signed my name to this specification in the presence of two subscribing witnesses.

PAUL WINSOR.

Witnesses:

J AS. H. CHURCHILL, J. MURPHY. 

